NPI (National Provider Identifier)
A 10-digit federal ID number for every U.S. healthcare provider.
Every licensed prescriber and many healthcare organizations have an NPI assigned by CMS. NPIs appear on prescriptions, claims, and referrals. They're public information — you can look up any provider's NPI in the NPPES Registry to verify credentials.
Medically reviewed by Dr. Ikechukwu Ogbu, MD
MD · Board-Certified, Internal Medicine · Last reviewed June 2026